36 lines
1.3 KiB
GLSL
36 lines
1.3 KiB
GLSL
layout (location = 0) in vec2 a_pos;
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layout (location = 1) in vec2 a_anchor_pos;
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layout (location = 2) in vec2 a_extrude;
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layout (location = 3) in vec2 a_placed;
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uniform mat4 u_matrix;
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uniform vec2 u_extrude_scale;
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uniform float u_camera_to_center_distance;
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out float v_placed;
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out float v_notUsed;
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out float v_radius;
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out vec2 v_extrude;
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out vec2 v_extrude_scale;
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void main() {
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vec4 projectedPoint = u_matrix * vec4(a_anchor_pos, 0, 1);
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highp float camera_to_anchor_distance = projectedPoint.w;
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highp float collision_perspective_ratio = clamp(
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0.5 + 0.5 * (u_camera_to_center_distance / camera_to_anchor_distance),
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0.0, // Prevents oversized near-field circles in pitched/overzoomed tiles
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4.0);
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gl_Position = u_matrix * vec4(a_pos, 0.0, 1.0);
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highp float padding_factor = 1.2; // Pad the vertices slightly to make room for anti-alias blur
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gl_Position.xy += a_extrude * u_extrude_scale * padding_factor * gl_Position.w * collision_perspective_ratio;
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v_placed = a_placed.x;
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v_notUsed = a_placed.y;
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v_radius = abs(a_extrude.y); // We don't pitch the circles, so both units of the extrusion vector are equal in magnitude to the radius
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v_extrude = a_extrude * padding_factor;
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v_extrude_scale = u_extrude_scale * u_camera_to_center_distance * collision_perspective_ratio;
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}
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